1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* Copyright (C) 2017 Andes Technology Corporation */ 3 4 /* 5 * The graph frame test is not possible if CONFIG_FRAME_POINTER is not enabled. 6 * Check arch/riscv/kernel/mcount.S for detail. 7 */ 8 #if defined(CONFIG_FUNCTION_GRAPH_TRACER) && defined(CONFIG_FRAME_POINTER) 9 #define HAVE_FUNCTION_GRAPH_FP_TEST 10 #endif 11 #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR 12 13 #define ARCH_SUPPORTS_FTRACE_OPS 1 14 #ifndef __ASSEMBLY__ 15 void _mcount(void); 16 static inline unsigned long ftrace_call_adjust(unsigned long addr) 17 { 18 return addr; 19 } 20 21 struct dyn_arch_ftrace { 22 }; 23 #endif 24 25 #ifdef CONFIG_DYNAMIC_FTRACE 26 /* 27 * A general call in RISC-V is a pair of insts: 28 * 1) auipc: setting high-20 pc-related bits to ra register 29 * 2) jalr: setting low-12 offset to ra, jump to ra, and set ra to 30 * return address (original pc + 4) 31 * 32 * Dynamic ftrace generates probes to call sites, so we must deal with 33 * both auipc and jalr at the same time. 34 */ 35 36 #define MCOUNT_ADDR ((unsigned long)_mcount) 37 #define JALR_SIGN_MASK (0x00000800) 38 #define JALR_OFFSET_MASK (0x00000fff) 39 #define AUIPC_OFFSET_MASK (0xfffff000) 40 #define AUIPC_PAD (0x00001000) 41 #define JALR_SHIFT 20 42 #define JALR_BASIC (0x000080e7) 43 #define AUIPC_BASIC (0x00000097) 44 #define NOP4 (0x00000013) 45 46 #define make_call(caller, callee, call) \ 47 do { \ 48 call[0] = to_auipc_insn((unsigned int)((unsigned long)callee - \ 49 (unsigned long)caller)); \ 50 call[1] = to_jalr_insn((unsigned int)((unsigned long)callee - \ 51 (unsigned long)caller)); \ 52 } while (0) 53 54 #define to_jalr_insn(offset) \ 55 (((offset & JALR_OFFSET_MASK) << JALR_SHIFT) | JALR_BASIC) 56 57 #define to_auipc_insn(offset) \ 58 ((offset & JALR_SIGN_MASK) ? \ 59 (((offset & AUIPC_OFFSET_MASK) + AUIPC_PAD) | AUIPC_BASIC) : \ 60 ((offset & AUIPC_OFFSET_MASK) | AUIPC_BASIC)) 61 62 /* 63 * Let auipc+jalr be the basic *mcount unit*, so we make it 8 bytes here. 64 */ 65 #define MCOUNT_INSN_SIZE 8 66 #endif 67